Why my phone's mobile data on and off automatically while its on ?

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Android Central Question

My device is HUAWEI p20 lite.

When i turned on mobile data manually, few times later its turned on and off automatically.
Sometimes i noticed that it will be alright, but when i used the data then it again turned it on and off automatically.

please give me a solution fix this problem.
 
Welcome to Android Central! Does that actually interfere with your routine usage, or is it only turning off when the phone is idle?